Fix resources __repr__ formatting

[vadim-su]

What do these changes do?

Cosmetic change.
Now, when printing resources, they will have a closing bracket.

I broke my head reading this:

[<StaticResource 'debugtoolbar.static' /_debugtoolbar/static -> PosixPath('/usr/local/lib/python3.6/site-packages/aiohttp_debugtoolbar/static'), <PlainResource 'debugtoolbar.source'  /_debugtoolbar/source, <PlainResource 'debugtoolbar.execute'  /_debugtoolbar/execute, <PlainResource 'debugtoolbar.exception'  /_debugtoolbar/exception, <PlainResource 'debugtoolbar.sse'  /_debugtoolbar/sse, <DynamicResource 'debugtoolbar.request'  /_debugtoolbar/{request_id}, <PlainResource 'debugtoolbar.main'  /_debugtoolbar, <PlainResource  /users/, <DynamicResource  /users/{user_id}, <PlainResource  /login, <PlainResource  /whoami, <PlainResource  /cars/, <DynamicResource  /cars/{car_id}, <DynamicResource  /cars/{car_id}/upload_image, <PlainResource  /cars/search, <PlainResource  /cars/brands/, <PlainResource  /cars/types/]

[asvetlov]

Would you add CHANGES note?

[codecov-io]

Codecov Report

Merging #2935 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #2935   +/-   ##
=======================================
  Coverage   97.99%   97.99%           
=======================================
  Files          40       40           
  Lines        7513     7513           
  Branches     1318     1318           
=======================================
  Hits         7362     7362           
  Misses         48       48           
  Partials      103      103

Impacted Files	Coverage Δ
aiohttp/web_urldispatcher.py	99.1% <100%> (ø)	⬆️

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[vadim-su]

Made the required changes.
Updated the commit.

[asvetlov]

Thanks!

[lock]

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If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new